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          点击绑定事件
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              <time title="创建时间：2020-03-09 20:32:06 / 修改时间：20:48:01" itemprop="dateCreated datePublished" datetime="2020-03-09T20:32:06+08:00">2020-03-09</time>
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        <p>click look more</p>
<a id="more"></a>

<h1 id="需求"><a href="#需求" class="headerlink" title="需求"></a>需求</h1><blockquote>
<p>点击右边的字母，然后跳转到对应的字母的城市列表</p>
</blockquote>
<p>如图，点击A 就显示到A。   点击B就显示到B</p>
<p><img src="/images/2.png" alt></p>
<hr>
<h1 id="解决方法"><a href="#解决方法" class="headerlink" title="解决方法"></a>解决方法</h1><h3 id="第一步思路"><a href="#第一步思路" class="headerlink" title="第一步思路"></a>第一步思路</h3><blockquote>
<p>首先要获取到点击的是什么东西，比如点击A就要获取到这个A。那么这个e代表的是什么呢？e其实就是点击事件，然后通过e的属性去获取到这个a。   这里可以通过控制台去查看</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">handleLetterClick(e)&#123;</span><br><span class="line">    <span class="built_in">console</span>.log(e.target.innerText)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="第二步思路"><a href="#第二步思路" class="headerlink" title="第二步思路"></a>第二步思路</h3><blockquote>
<p>现在已经获取到了点击的东西，那么就要想把它传给谁。既然要让城市列表联动，那么就一定是传给这个列表组件。这里就会涉及到vue兄弟组件间的传值。</p>
</blockquote>
<blockquote>
<p>因为这两个是同父组件，所以不需要用到BUS总线的方式。直接将其传给父组件，然后在又父组件传递给子组件，这样就实现了兄弟组件间的传值</p>
</blockquote>
<blockquote>
<p>那么如何做呢？这里需要提到一个属性  emit。它用来向外传递事件。比如这个代码的意思是，每次点击时，向外触发change事件，并且传递这个值</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">this</span>.$emit(<span class="string">"change"</span>,e.target.innerText)</span><br></pre></td></tr></table></figure>

<blockquote>
<p>那么如何去监听呢？假如是A组件使用emit，那么就到其父组件中的template中对应的模板中去监听。即当监听到change事件时，又触发handleLetterChange事件</p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">city-alphabet</span> <span class="attr">:cities</span>=<span class="string">"cities"</span> @<span class="attr">change</span>=<span class="string">"handleLetterChange"</span>&gt;</span><span class="tag">&lt;/<span class="name">city-alphabet</span>&gt;</span></span><br></pre></td></tr></table></figure>

<blockquote>
<p>然后将获取到的letter（即从子组件随着change事件传递过来的值）传给城市列表的子组件中。方法同使用mooc数据一样</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">handleLetterChange(letter)&#123;</span><br><span class="line">    <span class="keyword">this</span>.letter=letter</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="第三步思路"><a href="#第三步思路" class="headerlink" title="第三步思路"></a>第三步思路</h3><blockquote>
<p>问题又来了，当这个值传递给子组件后，该怎么使用？</p>
</blockquote>
<blockquote>
<p>思路是当监听到letter有变化后，就立即让开头字母为letter值的列表马上显示出来。所以接下来就是如何监听的事儿了。这里用到了watch侦听器。</p>
</blockquote>
<blockquote>
<p>还有一个问题，就是如何去改变列表的显示。由于这里使用的是better-scroll插件，所以会用到一个api</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">watch:&#123;</span><br><span class="line">    letter()&#123;</span><br><span class="line">        <span class="keyword">if</span>(<span class="keyword">this</span>.letter)&#123;</span><br><span class="line">            <span class="comment">// 需要获取的dom应该是整个area，而不是愚蠢的去获取title</span></span><br><span class="line">            <span class="comment">// 还有一点需要注意，如果是循环的，那么ref前面得加上冒号</span></span><br><span class="line">            <span class="comment">// 即写成 :ref</span></span><br><span class="line">            <span class="keyword">const</span> element=<span class="keyword">this</span>.$refs[<span class="keyword">this</span>.letter][<span class="number">0</span>]</span><br><span class="line">            <span class="keyword">this</span>.scroll.scrollToElement(element)</span><br><span class="line">            <span class="comment">// console.log(this.$refs) //&#123;A:Array(),B:Array(),.....&#125;</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>到此为止~</p>

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